<template>
  <div id="home" class="wrapper">
    <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
    <tab-control
        class="tab-control"
        :titles="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl1"
        v-show="isTabFixed"
      />
    <scroll class="content" ref="scroll" 
      @scroll="contentScroll" @pullingUp="loadMore"
     :probeType="3" :pullUpLoad="true">

     <home-swiper :banners="banners"  @swiperImageLoad="swiperImageLoad"/>
      <!-- 推荐信息展示 -->
      <recommend-view />
      <!-- 本周流行展示 -->
      <feature-view />
      <!-- 导航栏 -->
      <tab-control
        :titles="['流行', '新款', '精选']"
        @tabClick="tabClick"
        ref="tabControl2"
      />
      <!-- 下拉商品展示 -->
      <good-list :goods="showgood"></good-list>
    </scroll>
    <back-top @click.native="backClick" v-show="isShowBackTop"></back-top>
  </div>
</template>

<script>
import HomeSwiper from './childComps/HomeSwiper'
import RecommendView from "./childComps/RecommendView";
import FeatureView from "./childComps/FeatureView";

import NavBar from "components/common/navbar/NavBar";
import TabControl from "components/content/tabControl/TabControl";
import GoodList from "components/content/goods/GoodList";
import Scroll from "components/common/scroll/Scroll";
import BackTop from  "components/content/backTop/BackTop";

import { getHomeMultidata, getHomeGoods } from "network/home";
import {debounce} from "common/utils"

export default {
  name: "Home",
  components: {
    NavBar,
    HomeSwiper,
    RecommendView,
    FeatureView,
    TabControl,
    GoodList,
    Scroll,
    BackTop
  },
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] },
      },
      currentType: "pop",
      isShowBackTop: false,
      isTabFixed: false,
      tabOffsetTop: 0
    };
  },
  created() {
    // 1.请求多个数据
    this.getHomeMultidata();
    // 2.请求商品数据
    this.getHomeGoods("pop");
    this.getHomeGoods("new");
    this.getHomeGoods("sell");
  },
  mounted() {
     // 加载图片
    const refresh = debounce(this.$refs.scroll.refresh, 50)
    this.$bus.$on('homeItemLoad', () => {
      refresh()
    })
  },
  computed: {
    // 展示下拉商品列表
    showgood() {
      return this.goods[this.currentType].list;
    },
  },
  methods: {
    // 自定义方法
    tabClick(index) {
      // console.log(index);
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
      this.$refs.tabControl1.currentIndex = index;
      this.$refs.tabControl2.currentIndex = index;
    },
    backClick() {
      // console.log('1');
      this.$refs.scroll.scrollTo(0,0)
    },
    contentScroll(position) {
      // console.log(position);
      // console.log((-position.y) > 1000);
      // 1、判断BackTop是否显示
      this.isShowBackTop = (-position.y) > 1000
      // 2、判断吸顶效果
      // console.log((-position.y) > this.tabOffsetTop);
      this.isTabFixed = (-position.y) > this.tabOffsetTop
    },
    loadMore() {
      this.getHomeGoods(this.currentType)
    },
    swiperImageLoad() {
      // 加载轮播图计算长度
      // console.log(this.$refs.tabControl.$el);
      console.log(this.$refs.tabControl2.$el.offsetTop);
      this.tabOffsetTop = this.$refs.tabControl2.$el.offsetTop
    },
    // 网络请求相关方法
    // 1.请求多个数据
    getHomeMultidata() {
      getHomeMultidata().then((res) => {
        this.banners = res.data.banner.list;
        this.recommends = res.data.recommend.list;
        console.log(res.data);
      });
    },
    // 2.请求下拉商品数据
    getHomeGoods(type) {
      const page = this.goods[type].page + 1;
      getHomeGoods(type, page).then((res) => {
        this.goods[type].list.push(...res.data.list);
        this.goods[type].page += 1;
        console.log(res);

        // 完成下拉加载更多
        this.$refs.scroll.finishPullUp()
      });
    },
  },
};
</script>

<style scoped>
.home-nav {
  background-color: var(--color-tint);
  color: #ffffff;
}

/* .tab-control {
  position: sticky;
  top: 44px;
  z-index: 9;
} */
#home {
  height: 100vh;
  position: relative;
}
.content {
  overflow: hidden;
  position: absolute;
  top: 44px;
  bottom: 49px;
  right: 0;
  left: 0;
}
.tab-control {
    position: relative;
    z-index: 9;
  }
/* .content {
  height: calc(100%-93px);
  overflow: hidden;
} */
</style>
 